condition mean min max ZT0-3 10.23999 10.23999 10.23999 ZT4-7 6.72357 6.72357 6.72357 ZT8-11 5.534435 5.534435 5.534435 ZT12-15 5.30434 5.30434 5.30434 ZT16-19 7.14731 7.14731 7.14731 ZT20-23 11.048839999999998 11.048839999999998 11.048839999999998